Method of forming beaded articles



E K N u A H METHOD OF FORMING BEADED ARTICLES 2 Shets-5heeiz Filed Sept. 15, 1926 Patented thug. l3, 1929.

UNITED STATES PATENT OFFICE.

HERMAN A. mum, on CLEVELAND, 0310.

-ME'1HOD OF FORMING- .BEADED ARTICLES.

Application filed September 15,1926. Serial No. 135,544.

at ultimate use. 'While the method of making the thread protector is described with particular reterence to articles of this k nd, the method relates generallyto the formation it at a head or groove in a pressed metal tubutar article,

tn ohject oi the invention is to provide an improved method ct torxningsuch head or greens in thread protectors or ether tulouit lar articles that will produce such head or til hill

groove in connection with the drawing opera tion ot :l'orrning the article and without requiring an additional step, thereby produo the head or groove at practically no ad- "ional enpensc over the cost oil drawing article,

turther ohject the invention is to pro l ed for torming the head or groove we no Will result in hardening and sit oning tnres oil noveltywill be apparent trom the tollowing description tahen in connection with the accompanying drawings, ot which l is vertical section through a portion ot a stamping press hating dies therein are adapted to term thread rotectors and other articles in accordance with my in rentiong. higm h is a vertical section of the same at right angles to the section ct hig. l and heing on the line Ql@ oi l ig; it;

h is a bottom plan of the upper die, the section being on the line 3-3 of Fig. 1; Fig. t is a plan of the loottom die as seen trom the line 4l-t of Fig, l; Fig. 5 is an enlargement or a part of Fig. Q, with the dies shown in the position they occopy at the beginning of the forming operation of the article;

the pontion ot the article in which the head I Fig. 6 is a View similar to Fig. 5 but show ing the dies in about the middle position oi the forming operations. 7

Fig. 7 is a view similar to Fig. 5 but showing the dies in theiposition just preceding the completion of the article;

Fig. 8 shows the dies at the end of their formlng stroke, with the completed article therein;

Fig. 9 is a side elevation, partly in section, pt a thread protector embodying my invenion;

Fig. 10 is a side elevation ot the end of a piece ct pipe withthe thread protector there on, a portion ot the pipe and the protector being shown in section;

Fig, ii is an elevation of the'protector; seen llEOlll the headed end thereot; and

id is a "View similar to it but showing a slightly modified term ot con struction,

lteterring to 9 ill and Ill, will seen that the protector consists oil a tubular shell fill which is adapted to surround the threads 2i oil the ipe flit has an in -more nearly circular term and. hecause the structure has a certain amount cl resiliency opposite portions oil the head, on the shortest diameter oi the oral will enter the space be tween successive threads and loch the pro tectcr in position. .ht the same time the flange 23 will engage with the end oil the pipe and term a substantial seal at this point that will be adapted to exclude the materials that are used in the coating operations in making conduit and in galvaniaing. The head 24 also has substantialsealing cornicetion with the threads that will exclude objectionable quantities of the coating material. A factor which assists in excluding the coating material is that a certain amount ill tit

of air is trapped within the shell 20 and this air remains therein during the coating operations. The coating material used for conduit is very thick and viscous, and, therefore,

will not penetrate the relatively small spaces.

terial that will adhere to the threads is relatively small and not objectionable. At

the same time, it has suflicient rust-proofing qualities to prevent rusting of the threads while the pipe is in storage or in transit.

In the form of protector illustrated in Fig. 12, the beaded end 24 is slightly flattened at several points, as indicated at the three points 26;

Referring now to Figs. 1 to 8, the method of forming the thread protector will be described. In a general way this method is that commonly employed in the stamping of cup-shaped articles from sheet metal. The method, however, departs from the usuaL method in several important particulars in order to form the bead in the article and also for the purpose ofha-rdening and stiffening the portion of the article which contains the beadr A portion of the frame of an ordinary stamping press is shown at 27, and the usual bed-plate at 28. The ram of the press is indicated at 29 and'is slidable on the guides or ways 30. The ram 29 is rebase of the other die is shown at 36 and is secured on the bedplate 28 by the bolts 37. The base 36 carries a plurality of parallel extending guides 38 which project through the body member 31 and thus hold the two parts of the die in accurate alignment. The male forming die is shown at 39 and is carried by the base 36. It'is provided with a tapered bore 40 and itsupper end is adapted to cooperate with a punch 41, which, as shown in Figs. 2 and 6, is adapted to punch out the disk 42 from the end of the article.

A vertically movable collar 43 surrounds the male forming 'die 39 and slides in a cavity 44 of the female blankin die 45, the latter being positioned on the base 36.

The bore 46 of the die 34 conforms to the desired shape and size of the outer surface of the article to be formed, and, at the lower end of the bore 46, the die 34 has a well rounded corner 47 over which the metal of the blank is drawn in forming the article. The outer lower corner 48, of the die 34, cooperates with the die 45 to punch out the blank from the strip of metal 69 that constitutes the raw material that is fed to the press. Within the die 34 there is a slidable knock-out member 49 which surrounds the punch 41 and guides the latter, and the lower end 50 of which is adapted to engage the article, on the upward stroke of the press, and knock it out of the die 34.

A plurality of rods 51 extend through the base 36 and the bed-plate 28 and have their upper ends in engagement with the collar 43 and their lower ends in engagement with a disk 52, which is slidable on a rod 53 that has its upper end threaded into a bracket 54 that is secured to the underside of the base 36 by means of bolts 55.

- The bracket 54 has a slot 56 that is in alignment with the bore 40 of the die 39, and the disks 42 are discharged through this slot. The lower end of the rod 53 is threaded to receive an adjusting nut 57 which supports a collar 58. A spring 59 is arranged between thev disk 52 and the collar 58 and exerts upward pressure on the disk and, through the pins 51, on the collar 43. The tension of the spring 59 may be adjusted by means of the nut 57..

A plurality of rods 60 are slidably arranged in the member 31 and have their lower ends in engagement with the knock out collar 49. The upper ends of the rods 60 carry a bar 61 from which there projects a stud 62 which is adapted to engage with the bar 63 that is slidably mounted in the ram 29. Adjustable set screws 64 are mounted in lugs 65, on the guides 30, and are adapted to engage the bar 63 and ary rest its movement on the upward stroke of the press. Springs 66 are connected with the bar 63 and normally tend to hold it against the screws 64. On the downward stroke of the ram, the bar 63 is picked up thereby and carried along with it, the springs 66 being extended by this movement of the bar 63.

A stop-plate or stripper 67 is supported above the die 45 by means of studs 68, for the purpose of disengaging the strip of stock 69 from the die 34 on the upward stroke of the latter. The proper position of the stock 69, in the press, is determined by a gauge member 70 which is secured on the base 36 by means of the screw 71. The gauge member 70 -is engaged by the end of the strip 69, and the fore-and-aft position of the strip islocated by means of a guide pin 72.

As will be noted from the drawings, and particularly from Figs. 6 to 8, the clearance space 73 between the bore 46 of the die 34 till is greater than the thickness of the stock from which the article is formed. It is common practice, in making stamping dles, to niake this clearance s ace substantially equal to the thickness of t e stock, but, to carry out my invention, I make this clearance space at least double the thickness of the stock.

ln practicing my improved method, the strip of stock is placed in position, against the gauge and the pin 72, when the dies are in the position shown in Fig. 1. The press is then tripped in the usual manner, the ram 29 descending and carryin with it the die 34. When the lower end 0 the die 34 hits the stock it cooperates with the blanking die 45 to punch out the blank, the relative arrangement of these dies, at this. instant, being as shown in Fig; 5. It will be noted that the under surface of the blank is then in engagement with the upper end of the die 39, and the peripheral portion of the blank is clam ed between the lower end of the die 34 an the collar 43 by the pressure exerted by the spring 59. As the die 34 descends, the die 39 forces the blank into the bore 46, as shown in Fig. 6. The collar 43 descends with the die 34 and the spring'59 is thereby further compressed, thus increasing the. upward pressure against the collar 43. As the peri heral portion of the blank is drawn into t e bore 46, the area of the portion of the blank which is clamped between the die 34 and the collar 43 is gradually reduced so that the clamping pressure, per square inch, on this area gradually increases, due not only to the decrease in the area of the clamped portion but also to the increase, in the pressure exerted by the spring 59.

During the drawing operation just referred to, the blank is drawn around the corner 47, of the die 34, and, as the clamping pressure on the peripheral ortion of the blank increases, the work one upon the metal, in being drawn around the corner 47 materially increases and this work tends to harden the metal, as is well understood by those skilled in the art. The clamping pressure reaches its maximum just prior to the withdrawal of the peri hery of the blank from between the end 0 the die 34 and the collar 43, this position being indicated in Fig. 7 Hence the'metal adjacent the periphery or the blank will be subjected to the maximum amount of work, and will, therefore, harden to the greatest extent.

From. Fig. 2', it will be seen that in this stage of the operation the article has an outwardly flaring end, and, on account of this end being very much hardened in the drawing operation, the subsequent drawing of this flanged end intothe bore 46 will form a circum'terential bend in the metal adjacent the base of the said flaring portion, as shown at 74 in Fig. Thus the outwardly flaring flange that s in the blank, in the stage of the operation'lllustrated in Fig. 7, becomes theinward bead 24 seen in Fig. 9, the clear- On the upward stroke of the ram, the stock 69 engages the under-side of the stripper 67. The article will be carriedup with the die 34 until the bar 63 engages the screws 64, and then, upon engagement of the stud 62 with the bar 63, the collar 49 will be forced downwardly relative to the die 34 and knock the article outof the bore 46. At the same time, the spring 59 forces the collar 43 to its up er position, as shown in Fig. 1.-

n explanation of the drawings, it should be further stated that the dies, in Fig. 2, are

shown in the same position as in Fig. 8, that is, at the completion of the down stroke of the ram.

Having thus described my invention, I claim:

1. The herein described method 01': forming tubular metal parts with an internal head at one end which consists in forcing a metal blank into a hollow die having a rounded edge over which the metal of the blank is drawn, clamping the peripheral portion of the blank to increase the work done on the metal in drawing the periphery of the blank over the rounded edge of the die, releasing the clamping pressure when the edge of the blank reaches the curved edge of the die and then forcing the blank into the die sufliciently to carry the edge of the blank beyond the curved edge of the die.

2. The herein described method of forming tubular metal parts with an internal bead which consists in pressing a sheet metal blank into tubular form provided with an outwardly flaring flange at one end and at the same time so stressing the metal of saidflange as to substantially harden it and then pressin said flange inwardly and forming a circumferential bend in the part adjacent the base of said flange.

3. The herein described method of forming tubular metal parts with an internal head at one end which consists in pressing a sheet metal blank into tubular form provided with an outwardly flaring axially curved flange at one end-and at the same time so stressing the metal of said flange as to substantially harden it and then subjecting said flange to inward ressure throu hout its circumference to orm a circum erential bend in the part at the base of said flange and reduce the diameter of the edge of the flan e.

4. The herein described met 0d of forming tubular metal parts with an internal bead opening having a smaller diameter than the g at one, end which consists in pressi asheet edge of the flange and thereby forming an metal blank into tubular form provi ed with inward circumferential bend in the part ad- 1 an outwardly flaring axially curved flange jacent the base of the flange.

5 at one end and at the same time so stressing In testimony whereof, I hereunto afiix my the metal of said flange vas to substantially signature. harden it and then forcing the flange into an HERMAN A. UNKE. 

